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Origin Of Quantum Mechanics MCQ Level – 1


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Origin Of Quantum Mechanics MCQ Level – 1 - Question 1

If first excitation potential of a hydrogen-like atom is V eV, then the ionization energy of this atom will be :

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 1

First excitation energy

Origin Of Quantum Mechanics MCQ Level – 1 - Question 2

Linear momenta of a proton and an electron are equal. Relative to an electron

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 2

If pe = pp,

Origin Of Quantum Mechanics MCQ Level – 1 - Question 3

The wavelength of a photon and the de-Broglie wavelength of an electron and uranium atom are identical. Which one of them will have highest kinetic energy

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 3


for photon & electron

The correct answer is: Photon

Origin Of Quantum Mechanics MCQ Level – 1 - Question 4

The energy E and momentum p of photon is given by E = hv and  p = h/λ, the velocity of photon will be :

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 4

E = hc/λ     put c = v
and  p = h/λ
E = pv
⇒ v = E/p 

The correct answer is: E/p

Origin Of Quantum Mechanics MCQ Level – 1 - Question 5

In the figure six lines of emission spectrum are shown. Which of them will be absent in the absorption spectrum.

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 5

The photon’s with energies equal to that required for upward transition A → X, A → B and A → C would be absorbed, these photons shall be absent from absorption spectrum.

The correct answer is: 1, 2, 3

Origin Of Quantum Mechanics MCQ Level – 1 - Question 6

A charge particle q0 of mass m0 is projected along the y-axis at t = 0 from origin with a velocity V0. If uniform electric field E0 also exists along the x-axis, then the time at which de-Broglie wavelength of the particle becomes half of the initial value is :

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 6

Initial debrogle wavelength of the charge particle

After any time t,

Suppose after time t,  λ becomes half of the initial value i.e.

Origin Of Quantum Mechanics MCQ Level – 1 - Question 7

What voltage must be applied to an electron microscope to produce electrons of 

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 7


The correct answer is: 150 Volt

Origin Of Quantum Mechanics MCQ Level – 1 - Question 8

In X-rays production an electron accelerated with voltage V strikes a metal target. For which of the following voltages X-rays of minimum wavelength will be produced :

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 8

 λ will be minimum for maximum accelerated voltage 
The correct answer is: 40 kV

Origin Of Quantum Mechanics MCQ Level – 1 - Question 9

In the photoelectric, if we use a monochromatic light, the I-V curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = 10–3 % i.e. number of photoelectrons emitted are 10–3 % of number of photons incident on metal.)

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 9

The energy of incident photons is given by

(Vs is stopping potential and  is work function)
Saturation current =  (η is photo emission efficiency)
∴ P = 7mW
The correct answer is: 7mW

Origin Of Quantum Mechanics MCQ Level – 1 - Question 10

In Davisson-Germer experiment the relation between the angle of diffraction θ and the grazing angle φ is.

Detailed Solution for Origin Of Quantum Mechanics MCQ Level – 1 - Question 10

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